Properly set background color for sub toolbars, fixes #4884

[samdroid-apps]

The .toolbar selector only applies to the toolbar content zone,
so by including the container the margin can also be styled with
the correct background color (specifically for gtk 3.17+).

Requires: sugarlabs/sugar-toolkit-gtk3#255
Fixes: https://bugs.sugarlabs.org/ticket/4884

[i5o]

Testing

[i5o]

Works for me.

[ignacio@ignacio-pc ~] $ lsb_release -a
LSB Version:    :core-4.1-ia32:core-4.1-noarch:cxx-4.1-ia32:cxx-4.1-noarch:desktop-4.1-ia32:desktop-4.1-noarch:languages-4.1-ia32:languages-4.1-noarch:printing-4.1-ia32:printing-4.1-noarch
Distributor ID: Fedora
Description:    Fedora release 23 (Twenty Three)
Release:    23
Codename:   TwentyThree
[ignacio@ignacio-pc ~] $ pkg-config --modversion gtk+-3.0
3.18.1
[ignacio@ignacio-pc ~] $ 

Tested Pippy and Chat

Patch not applied:

Applied patch: